【学习C++】C++ Primer Plus （第六版）第九章编程练习1-4

1.

//golf.hconst int Len = 40;struct golf{char fullname[Len];int handicap;};void setgolf(golf & g, const char * name, int hc);int setgolf(golf & g);void handicap(golf & g, int hc);void showgolf(const golf & g);//golf.cpp#include <iostream>#include "golf.h"void setgolf(golf & g, const char * name, int hc){g.handicap = hc; \int len = strlen(name);for (int i = 0; i < Len; i++){g.fullname[i] = name[i];}}int setgolf(golf & g){std::cout << "Please enter the fullname : ";char name[Len];std::cin.getline(name, Len);std::cout << "Please enter handicap : ";int han;std::cin >> han;std::cin.get();setgolf(g, name, han);if (name[0] == '\0')return 0;elsereturn 1;}void handicap(golf & g, int hc){g.handicap = hc;}void showgolf(const golf & g){std::cout << g.fullname << ", "<<g.handicap<<std::endl;}//main.cpp#include <iostream>#include "golf.h"int main(){golf gl[3];for (int i = 0; i < 3; i++){if (setgolf(gl[i]) == 0)break;}for (int i = 0; i < 3; i++)showgolf(gl[i]);for (int i = 0; i < 3; i++){handicap(gl[i], 1);showgolf(gl[i]);}std:: cin.get();return 0;}

2.

#include <iostream>#include <string>using namespace std;void strcount(const string);int main(){string input;cout << "Enter a line: \n";getline(cin, input);while (input != "\0"){strcount(input);cout << "Enter next line (empty line to quit) : \n";getline(cin, input);}cout << "Bye\n";return 0;}void strcount(const string str){static int total = 0;int count = str.size();total += count;cout << "\"" << str << "\"contains ";cout << count << " characters\n";cout << total << " charaters total\n";}

3.

#include <iostream>struct chaff{char dross[20];int slag;};char buffer[60];using namespace std;int main(){chaff *ch = new(buffer) chaff[2];for (int i = 0; i < 2; i++){char cha[20];cin.get(cha, 20);while (cin.get() != '\n')continue;strcpy(ch[i].dross, cha);int a;cin >> a;ch[i].slag = a;cin.get();}for (int i = 0; i < 2; i++){cout << ch[i].dross << " ," << ch[i].slag;cout << "  address : " << &ch[i] << endl;}cout << "buffer address : " << (void *) buffer << endl;cin.get();return 0;}

4.

//sales.hnamespace SALES{const int QUARTERS = 4;struct Sales{double sales[QUARTERS];double average;double max;double min;};void setSales(Sales & s, const double ar [], int n);void setSales(Sales & s);void showSales(const Sales & s);}//sales.cpp#include <iostream>#include "sales.h"namespace SALES{void setSales(Sales & s, const double ar [], int n){int times = QUARTERS < n ? QUARTERS : n;double total = 0;double ma=ar[0], mi=ar[0];for (int i = 0; i < times; i++){s.sales[i] = ar[i];total += s.sales[i];if (ma < ar[i])ma = ar[i];if (mi>ar[i])mi = ar[i];}for (int i = times; i < QUARTERS; i++){s.sales[i] = 0;}s.average = total / times;s.max = ma;s.min = mi;}void setSales(Sales & s){double total=0;for (int i = 0; i < QUARTERS; i++){std::cin >> s.sales[i];total += s.sales[i];}double ma = s.sales[0],mi=s.sales[0];for (int i = 0; i < QUARTERS; i++){if (ma < s.sales[i])ma = s.sales[i];if (mi>s.sales[i])mi = s.sales[i];}s.average = total / 4;s.max = ma;s.min = mi;}void showSales(const Sales & s){std::cout << "values:\n";for (int i = 0; i < 4; i++)std::cout << s.sales[i]<<std::endl;std::cout <<"average: "<<s.average << std::endl;std::cout << "max: "<<s.max << std::endl;std::cout << "min: "<<s.min << std::endl;}}//main.cpp#include <iostream>#include "sales.h"int main(){SALES::Sales a, b;double ar[3] = { 0.1, 0.2, 0.3 };SALES::setSales(a, ar, 3);SALES::showSales(a);std::cout << "Please input 4 numbers: \n";SALES::setSales(b);SALES::showSales(b);std::cin.get();std::cin.get();return 0;}